Pump



April 7, 1925.

H. s. PARDEE f PUMP Filed May 26, 1920 Patented ipr. 7, 1925.

HAR-vin! s. or cnicas-o, ILLINOIS.

PUMP.

Application ,tiled May 2G, 192'). ySerial No. 384,498.

in installations of the pressure-reservoir type; the provision of a reliable and durable structure that is self-priming; and the provision of a pump that isr effective in action, easily assembled and readily disassembled for such purposes as inspection and repair.

Other lobjects will be in part obvious and in part lpointed out hereinafter.

The invention accordingly consists of the elements and combinations of elements, features of construction, land arrangements of parts which will be exemplified in the structure hereinafter described and a scope of the application `of which will be indicated in the following claims. a

ln the accompanying drawings, in which is shown one of variouspossible embodiments of the invention,

Fig. 1 is a sectional elevation of a prelferred pump construction;

Fig. 2 .is a similar view, showing` the right-hand portion `of Fig. 1 on an enlarged scale; and f Fig. 3 is a section on the lineB-3, Fig. 2.

Similar reference characters indicate corresponding parts throughout the severall -views of the drawings.

Referring now more particularly to AFig. l of rthe accompanying drawings, ,there is i-llustrated a pump,`in this instance a plunger-type pump having a` piston 1 opera-ted .by a connecting rod 3 in a cylinder 5 land retained in position therein by packing 7 held by glands 9. .The vertical reciprocation of the piston is eected by a source of power (not shown) acting vthroughv the .connecting rod 3. The upward stroke is the .intake or suction stroke; the downward stroke is the delivery or pressure stroke. With certain modifications within .the scope of this invention the features hereinafter described and claimed may be embodied in a double- -acting pump, as well as in other related .apparatus f The fluid, 'in this instance water, normally enters vthe pump chamber 11 from the source of supply such as a pipeline v(not shown) lthrough the vintake port 13 under the intake valve 16 during the upward stroke of the pump. At this time the pressure in the pipe-line is greater than the pressure in the main chamber 11 by an amount sutlicient to force the intake valve 15 upwardly off its seat 17, against the pressure of the compression spring '19, and water Iis thus admitted to the main chamber 11.v

At the end of the upward orA suction stroke of the pump this pressure difference disappears, the intake valve 15 reseats itself, and during the downward or pressure stroke of the pump water is forced from the main chamber 11 upwardly past the delivery valve 21 into the Ydischarge chamber 23 and thence into the discharge port 25, the excess of 1aressure in main chamber 11 as compared with discharge chamber 23 yforcing the discharge valve 21 upwardly off its seat 27 against the action of the compression spring 29.

The Atwo valves 15, 21, as will lbe clear from F ig. 17 4are preferably so constructed as to afford substantially a line-contact, af-

fording accuracy of lit and facilitating the tion. By removing the threaded cap' Stand the `seat member 27 (which is preferably wedged ,in its support 83), the valve gear may be lifted out and the valves and seats thus readily made accessible for inspection, regrinding and repair. Y

p The pump of thepresent invention is .particularly useful in supplying water to a socalled pressure-reservoir system, in which the receiving` tank is partly filled with water and partly with air under pressure, the air acting to maintain the water pressure .and deliver the water through the supply conduits -when the pump is not working. Water 'insuch a tank, however, has a tendency to absorb the air therein, with ther result that the amount of airis progressively decreased and the `effectiveness of the system thereby '.lessened, and the air even be all absorbed by the water` .causing the reservoir t0 become what is known as water-logged. `Asp-'hereinafter described, the pump of the present invention is ladapted vto pump a given ,amount ,of air into the storage tank. along with the water. lthis airoinpensatng for .the `absorption above mentioned and .serving CIT to maintain in the reservoir the quantity ot air needed for satisfactory operation.

This inspir tion of air into the Vwater passingV tlnoug'h the pump is effected through the inspirating port ?5 *leading from a float chamber 37, through the support 23S-and valve seat 27,' and terminating at a point close to the discharge valve 21. so that air passing` through said inspiratingr port is delivered in close proximity to the discharge valve and isdthereforc. not liable to become trailiped, but passes through into the discharge chamber 253 as soon as the discharge valve is lifted. Y

The float chamber 37 communicates with the main pump chamber 11 by a passage 39 and thus has water in it when the main chamber has water in it. This causes the tloat 41 to rise on its pin 43 and press the ball 45 upwardly against its seat 47. thereby preventing' communication bet veen the float chamber and the passage 49 leading to au upper chamber 51 open to atmosphere at During the upward or suction stroke of the pump the upper ball 55 rests on its 57 and prevents any flow of air from atmosphere in the upper chamber 51 directly into the passage 49. There is. however. a needle valve 59 controlling` the by-pass 61 from the upper chamber 51 to the passage 49 and this valve is preferably so adjusted as to allow the desired amount of air to flow from atmosph ,re 51 through the bypass 61 into the passage 49, under the influence of the sub-atmospheric pressure in the main chamber 11 at this time (that is` during the suction stroke). During; this Vflow of air the lower ball 45 is depressed slightly away from its seat to allow the air from the passage 49 to pass into the inspirating port and thence under the discharge valve 21, where it collects until the pressure stroke takes place, wnereupou the discharge valve is lifted as above described and the air is forced into the discharge chamber and port together with the water. During' this pressure stroke of the pump the pressure in the main chamber 11 is above atmospheric, and the 'float raises the lower ball against its seat and prevents any discharge of air or water through the passage 49. The amount of inspirated air can be adjusted within wide limits by the needle valve 59. Y

Another feature of this invention is th automatic priming above mentioned. When the pump is started dry, there is air in the main chamber 11 and float chamber 37. and the float 41 and lower ball 45 are down, leaving' the passava 49 open to the float chamber 37. On the downward or pressure stroke of the piston 1 some of the air in the main chamber 11 will be forced outward through the passage 49, lifting the upper the main chamber 1l.

ball from its seat 47, and passing` thence to atmosphere at 51. @n the succeeding suction stroke the ball will. seat itself, preventinga rapid flow of air into the pump chamber, the needle valve 59 allowing only a small amount of air to be admitted. Suction is thus cated in the mainchamber. Succeeding cycles of this Voperatin increase the suction in the Vmain chamber until the pressure (initially atmospheric) Vordinarily existing' in the pipe-line and intake port 13 is sutlicient to lift the intake valve 15 against its spring' 19, drawing into the main chamber 11 some of the air from the pipe-line and intake port 13. This air is in turn discharged through the passage 49 as above described. After a sufficient number of cycles have occurred the suctionin the intake port 13 is great enough to raise the level of the water in tlrepipe-line until the water reaches the intake valve 15 and enters llVhen this occurs the float 41 will rise and seat the lower ball 45. After this on the pressure stroke any air in the main chamber is forced out under the discharge valve 21 as during: normal operation, and, the pump automatically begrins to operate in the normal manner.

The priming feature and the inspirating feature ma)Y of course be used together, or either may be provided without the other, without departing from the spirit or scope of the present invention.

From the above it will be seen that in the apparatus of the present invention the several objects above noted are attained and other advantageous results secured.

As various possible .embodiments might be made of the above invention and as various changes might be made in the embodiments above set forth, it is to be understood that all matter herein set forth or shown -in the accompanying; drawings is to be interpreted as illustrative and not in a limiting sense.

I claim: I

1. In apparatus of the class described, in combination, la pump having; a piston and intake and discharge valves, means for drawing` in air during each suction stroke and delivering' it adjacent the discharge valve, the air being forced into the discharge port during the succeeding pressure stroke of the pump, and a check valve with restricted by-pass, for automatically priming the pump.

2. ln apparatus of the ola-ss described, in combination, a pump, and means for automatically priming the pump, `said means comprising a check valve open to atmosphere, a float valve adapted to shut off the passage to the check valve except when the pump is dry, whereby the pump exhausts the air in the intake, discharging said air through said check valve until the water llO 3.l In apparatus of the class described, in

"L combination, a pump having a piston.. a

main chamber, an intake valve, and a discharge valve, both ot said valves having substantially line contact with their seats, and means l'or automatically priming the pump, said means comprising a check Vvalve opening to t valve adapted to shut oil the passage from main chamber to check valve except when the main chamber is dry, whereby the pump exhausts the air in the main chamber and in the intake, discharging said air through said check valve until the water in the intake is lifted to the main chamber, whereupon the float valve cuts` ofi0 further escape ot' air to atmosphere tl'irough said check valve.

4l. in apparatus of the class described, in combination, a pump having a piston, a main chamber, an intake valve, a discharge valve, means for preventing water-logging otl the system supplied by the pump and means for automatically priming the pump, said last means comprisinga check valve with restricted by-pass, for progressively increasing the suction in the pump chamber during successive cycles of operation when the pump is started dry. f t

t 5. In apparatus ot' the class described, in combination, a pump, means :tor preventing` water-logging o the system supplied by the pump, and means tor automatically priming the pump, said second means comprising a check valve to atn'iosphere, al lioat valve adapted to shut olif the passage to said check valve` except when the pump is dry, whereby the pump exhausts the air in the intake, discharging said air through said check valve until the water in the intake is lifted to the pump, whereupon the iioat valve cuts 0d' further escape of air to atmosphere and the pump begins to operate normally.

6. In apparatus ot the class described, in combination, a pump having a piston, a main chamber, an intake valve anda discharge valve, means for drawing in automatically a predetermined amount oi" air during each suction stroke and delivering` it adjacent the discharge valve, the air being forced into the discharge port during the succeeding` pressure stroke of the pump; and means for automatically priming the pump, said second means comprising a check valve to the atmosphere, and means adapted to shut off the passage from main chamber to check valve execpt when the main chamber is dry. f

Y. ln apparatus ot' the class described, in combination, faction plunger pump having a piston, a main` chamber, an intake ilve, and a discharge valve, both ot said i, aivcs having substantially line contact with their seats, means for aut matically priming the pump, said means comprising an auxiliary chamber having a check valve to atmosphere, a float valve adapted to shut the passage from main chamber to check valve except when the main chamber is dry, whereby the pump exhausts the air in the main chamber and in the intake, discharging said air through said check valve until the water in the intake is lifted to the main chamber, whereupon the Yfloat Valve cuts oit further egress of air to atmosphere through said check valve and the pump automatically begins to operate normally.

8. ln apparatus of the class described, in combination, a suction plunger pump having a piston, a main chamber, an intake valve, and a discharge valve, both oi said valves having substantially line contact with their seats, means comprising an aux iliary chamber provided with a check valve for inspirating automatically a predetermined adjustable amount ozt air during each suction stroke and delivering` it directly beneath the discharge valve, the air being tor-ced into Vthe discharge port during the succeeding pressure stroke or the pump,- and means for automatically priming' the pump, said last named means comprising said auX- iliary chamber having a check valve to atmosphere, a float valve adapted to shut o said passage except when the main chamber is dry, whereby the pump exhausts the air in the main chamber and in the intake, discharging said air through said check valve until the water in the intake is lifted to the main chamber, whereupon the float valve cuts oif further egress of air to atmosphere through said check valve, and the pump automatically begins to operate normally. i

in testimony whereof, l have signed my name to this specification this 22nd day of lsay, 1920.

HARVEY S. PARDEE.

Cil 

